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Income Taxes (Narrative) (Details) - USD ($) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2021 | Jan. 07, 2021
Income Tax [Line Items] |  |  |  |  |  |
Deferred income taxes |  |  |  |  |  | $ 249,000,000
Federal valuation allowance amount removed |  | $ 893,000,000 | $ 1,355,000,000 |  |  |
Income tax expense (benefit) |  | 65,000,000 | (547,000,000) | $ (30,000,000) |  |
Current income tax expense (benefit) |  | 16,000,000 | (219,000,000) | (5,000,000) |  |
Deferred income tax expense (benefit) |  | 49,000,000 | $ (328,000,000) | (25,000,000) |  |
Valuation allowance against deferred tax assets, percent |  |  | 100.00% |  |  |
Unrecognized tax benefits increased |  | 5,000,000 |  | $ 14,000,000 |  |
Net operating loss carryforwards, deferred tax assets |  | 1,075,000,000 | $ 238,000,000 |  |  |
Net operating loss carryforwards |  | 57,000,000 |  |  |  |
Unrecognized tax benefits, interest expense (benefit) |  | 1,000,000 |  |  |  |
Unrecognized tax benefits, penalties |  | 0 |  |  |  |
Unrecognized tax benefit that would impact effective tax rate |  | 36,000,000 | 23,000,000 |  |  |
Unrecognized tax benefits, decrease resulting from current period tax positions |  |  | 42,000,000 |  |  |
Deferred unrecognized tax benefits |  | 42,000,000 | 50,000,000 |  |  |
Severance tax refunds |  | 39,000,000 | 40,000,000 |  |  |
AMT Credit Carryforward [Member] |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Severance tax refunds |  | 83,000,000 |  |  |  |
U.S. [Member] |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Income tax expense (benefit) | $ (16,000,000) |  |  |  |  |
Canadian Business Segment [Member] |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Effective close date of divestiture |  |  |  | Jun. 27, 2019 |  |
CARES Act [Member] |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Income tax expense (benefit) |  |  | (113,000,000) |  |  |
Current income tax expense (benefit) |  |  | (220,000,000) |  |  |
Deferred income tax expense (benefit) |  |  | $ 107,000,000 |  |  |
United States Federal [Member] |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Federal valuation allowance amount removed |  | 303,000,000 |  |  |  |
Net operating loss carryforwards |  | 711,000,000 |  |  |  |
United States Federal [Member] | Expiring in 2037 [Member] |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Net operating loss carryforwards |  | $ 654,000,000 |  |  |  |
United States Federal [Member] | Maximum [Member] |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Net operating loss carryforward, expiration date |  | Dec. 31, 2037 |  |  |  |
United States Federal [Member] | Minimum [Member] |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Net operating loss carryforward, expiration date |  | Dec. 31, 2030 |  |  |  |
Various U.S. States [Member] |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Net operating loss carryforwards |  | $ 364,000,000 |  |  |  |
Various U.S. States [Member] | Maximum [Member] |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Net operating loss carryforward, expiration date |  | Dec. 31, 2040 |  |  |  |
Various U.S. States [Member] | Minimum [Member] |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Net operating loss carryforward, expiration date |  | Dec. 31, 2022 |  |  |  |
Canada [Member] |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Federal valuation allowance amount removed |  | $ 559,000,000 |  |  |  |
WPX Merger [Member] |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Deferred income taxes |  |  |  |  | $ 249,000,000 |
WPX Merger [Member] | United States Federal [Member] |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Federal valuation allowance amount removed |  | $ 84,000,000 |  |  |  |

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